Cambridge IGCSE Chemistry - 0620 - Core Paper 1 2014 Winter Zone 2

Ethanol is made by fermentation.
How is ethanol obtained from the fermentation mixture?

Which statement is an example of diffusion?

A mixture is separated using the apparatus shown.

What is the mixture?

What is different for isotopes of the same element?

Slate has a layered structure and can easily be split into thin sheets.
Which diagram shows a structure most like that of slate?

Sodium chloride is an ionic solid.
Which statement is not correct?

Caesium chloride and rubidium bromide are halide compounds of Group I elements.
Caesium chloride has the formula ......1......, a relative formula mass ......2...... that of rubidium bromide and bonds that are ......3.......
Which words correctly complete gaps 1, 2, and 3?
[Table_1]

Which element has the atomic structure shown?

How many atoms of hydrogen are there in a molecule of ethanol, $\text{C}_2\text{H}_5\text{OH}$?

Which metal could not be used for electroplating by using an aqueous solution?

Which products are formed at the electrodes when a concentrated solution of sodium chloride is electrolysed? [Table_1]

Iron forms an oxide with the formula $Fe_2O_3$.
What is the relative formula mass of this compound?

Which statements about exothermic and endothermic reactions are correct?
1. During an exothermic reaction, heat is given out.
2. The temperature of an endothermic reaction goes up because heat is taken in.
3. Burning methane in the air is an exothermic reaction.

A power station was designed to burn gaseous fuels only.
Which two substances could be used?

The diagram shows the change from an anhydrous salt to its hydrated form.

Which statement is correct?

The rate of a reaction depends on temperature, concentration, particle size and catalysts.
Which statement is not correct?

Which changes decrease the rate of reaction between magnesium and air?
1. heating the magnesium to a higher temperature
2. using a higher proportion of oxygen in the air
3. using magnesium ribbon instead of powdered magnesium

Which substance is the most acidic?
[Table_1]

The equations for two reactions P and Q are given.
P   \( 2\text{NaNO}_2 + \text{O}_2 \rightarrow 2\text{NaNO}_3 \)
Q   \( 2\text{HgO} \rightarrow 2\text{Hg} + \text{O}_2 \)
In which of these reactions does oxidation of the underlined substance occur?
[Table_1]

The positions of elements W, X, Y and Z in the Periodic Table are shown.
Which elements form basic oxides?

How many different salts could be made from a supply of dilute sulfuric acid, dilute hydrochloric acid, copper, magnesium oxide and zinc carbonate?

Elements in Group I of the Periodic Table react with water.
Which row describes the products made in the reaction and the trend in reactivity of the elements?
[Table_1]

The graph shows how the pH of soil in a field changes over time.
At which point was the soil neutral?

The table shows the reactions of four different metals with water.

[Table_1]

What is the correct order of reactivity, from most reactive to least reactive?

An inert gas X is used to fill weather balloons.
Which descriptions of X are correct?
[Table_1]
number of outer electrons in atoms of X | structure of gas X
A: 2 | single atoms
B: 2 | diatomic molecules
C: 8 | single atoms
D: 8 | diatomic molecules

An element X has the two properties listed.
1. It acts as a catalyst.
2. It forms colourless ions.
Which of these properties suggest that X is a transition element?
[Table_1]

The oxide of element X is reduced by heating with carbon. Element X does not react with cold water, steam or dilute hydrochloric acid. What is X?

Which information about an element can be used to predict its chemical properties?

Aluminium is the most common metal in the Earth's crust. Which is not a property of aluminium?

Which reaction involves oxidation?

Which object is \textit{least} likely to contain aluminium?

Which method can be used to obtain ammonia from ammonium sulfate?

Which is an air pollutant that affects a part of the body other than the lungs and blood system?

Which statement about methane is not correct?

Which method of purification would produce water most suitable for drinking?

Which molecular structure shows hexene?

Increasing the number of atoms in one molecule of a hydrocarbon increases the amount of energy released when it burns.
What is the correct order?
[Table_1]

Which statement about alkenes is not correct?

The diagram shows three repeat units in the structure of an addition polymer.

Which alkene monomer is used to make this polymer?

Ethanol can be manufactured from substance X.

substance X + steam \(\xrightarrow{\text{catalyst}}\) ethanol

What is substance X?